Power semiconductor switching device driving power supply circuit device and starting method thereof

Abstract

The embodiment of the invention discloses a power semiconductor switching device driving power supply circuit device and a starting method thereof. The power supply circuit device comprises a PWM generation and control circuit, a DC power supply, a drive circuit, a power supply control circuit, a chopper circuit and a rectification circuit. The DC power supply is electrically connected with the power supply control circuit; the PWM generation and control circuit is electrically connected with the chopper circuit; the chopper circuit is arranged corresponding to the rectification circuit, the drive circuit is electrically connected with the rectification circuit, the power supply control circuit is electrically connected with the chopper circuit and the PWM generation and control circuit; and the power supply control circuit realizes soft start of the power supply circuit by controlling the power supply time difference of the chopper circuit and the PWM generation and control circuit for chopper control. The device is simple in logic and easy to implement; besides, the situation that a special high-cost power supply management chip must be used is avoided; the cost can be greatly reduced, the loss caused by the supply problem is reduced, remarkable economic benefits are achieved, and meanwhile, the circuit design becomes more flexible.

Description

technical field [0001] The invention relates to the field of power supply technology, in particular to a power semiconductor switching device driving power supply circuit device and a starting method thereof. Background technique [0002] Semiconductor switching devices, such as IGBTs and MOSFETs, are required in power conversion equipment such as electric vehicle controllers. Especially for a high-power power conversion device, the switch drive of the power semiconductor device requires a special drive power supply circuit to provide power for the drive circuit that drives the switch of the semiconductor device. The source of the driving power is usually the low-voltage DC power supply of the control part. For the electric vehicle controller, the source is the 12V / 24V low-voltage battery of the vehicle. Usually, in order to ensure safety and realize the isolation of high and low voltage sides, an isolated DC / DC power supply is used. At present, there are mainly two types ...

AI Technical Summary

Problems solved by technology

[0005] (1) It must be controlled by closed-loop control, requiring a special flyback power supply chip or a complex feedback control circuit to realize the start-up of the power supply and the control of the output voltage

Especially for occasions that require certain isolation safety regulations, the feedback circuit needs to be added with an isolation link (such as attached figure 1 ), significantly increasing the cost;

[0006] (2) The chopper circuit of the flyback topology has the situation that the inductor current is forced to commutate, which will generate electromagnetic interference such as leakage inductance peaks, which seriously affects the EMC effect of the system

The circuit principle of this method is relatively complicated, and it is difficult to realize it with a simple logic circuit, especially for the half-bridge / full-bridge circuit that needs to output two complementary PWMs, it must be realized by using a dedicated integrated circuit.

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